<!DOCTYPE html>
<html>

	<head>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
		<title>Test</title>
		<style type="text/css">
			* {
				margin: 0 auto;
				padding: 0;
			}
			
			.btn {
				width: 100px;
				height: 30px;
				line-height: 30px;
				background: green;
				color: #fff;
				border-radius: 10px;
				-webkit-border-radius: 10px;
				text-align: center;
				display: block;
				text-decoration: none;
			}
			
			.container {
				background: #e5e5e5;
			}
		</style>
		<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
		<script src="js/html2canvas.js"></script>
		<script>
			$(function() {
				$("#btn").click(function() {
					html2canvas($("#container"), {
						
						onrendered: function(canvas) {
							//把截取到的图片替换到a标签的路径下载  
							$("#download").attr('href', canvas.toDataURL());
							//下载下来的图片名字  
							$("#download").attr('download', 'share.png');
							document.body.appendChild(canvas);
						}
						//可以带上宽高截取你所需要的部分内容  
						//          ,  
						//          width: 300,  
						//          height: 300  
					});
				});
			});
		</script>
	</head>

	<body>
		<div style="padding:10px 0">
			<div class="btn" id="btn">截取屏幕</div>
			<p style="color:red; text-align:center;">先点击截取屏幕后再点击截图下载</p>
			<div style="margin-top:10px">
				<a href="javascript:;" class="btn" id="download">截图下载</a>
			</div>
		</div>
		<div class="container" id="container">
			<p style="text-align:center">以下是测试内容</p>
			<img src="">
		</div>
	</body>

</html>